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Most efforts to combat such mosquito-borne diseases like malaria and

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Most efforts to combat such mosquito-borne diseases like malaria and dengue have focused either on the vaccination of humans or on exterminating mosquitoes with pesticides.
A and dengue have focused either on the vaccination of humans or on exterminating
B like malaria and dengue have focused either on vaccinating of humans or on the extermination of
C as malaria and dengue have focused on either vaccinating humans or on exterminating
D as malaria and dengue have focused on either vaccinating of humans or on extermination of
E as malaria and dengue have focused on either vaccinating humans or exterminating

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GMATwithCJ
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Solution

Sentence Analysis

The sentence essentially means that most efforts to combat diseases have focused on either of the two things:

  • vaccination of humans
  • exterminating mosquitoes with pesticides

The first problem with the sentence is that it uses "like" with "such". Even though "like" can be used to offer examples (OG17 Q685 uses like to offer examples), it cannot be used in conjunction with "such". You either use "such as" or "like"; don?t mix them together. It?s incorrect.

Also, since we are using action noun "vaccination" in one part of the "either or" structure, it is highly preferable to use action noun instead of the currently used gerund "exterminating". Or we can have both in the form of gerunds.

Therefore, the original sentence has one major error and one area of improvement.

Option Analysis

(A) Incorrect . For the errors mentioned above.

(B) Incorrect . Incorrect. For the following reasons:

  1. "Such like" is idiomatically incorrect.
  2. "Vaccinating" is not entirely parallel to "the extermination". When we have an action noun for a verb, it is always recommended to use the action noun to make it parallel to an action noun or another noun. Therefore, it is highly preferable to use "vaccination" instead of "vaccinating". In addition, "vaccinating of humans" should be preceded by "the". Please note that we should never use an article in front of the construction "vaccinating humans" (i.e. simple gerund). However, in constructions such as "vaccinating of humans" (complex gerunds), we generally have an article.

(C) Incorrect . The part after "either" ? vaccinating ? and the part after "or" ? on exterminating ? are not parallel. One is a gerund; the other is a prepositional phrase. In addition, they are not even logically parallel. One cannot replace the list with the second element of the list.

(D) Incorrect . The part after "either" ? vaccinating ? and the part after "or" ? on extermination ? are not parallel. One is a gerund; the other is a prepositional phrase. In addition, they are not even logically parallel. One cannot replace the list with the second element of the list.

(E) Correct . This option uses the correct idiom "such as". Also, "vaccinating" and "exterminating" are parallel.

answered Jun 5 by Beginner (1 point)
gmatclubforum
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Top Pick from GMAT Club Forum

This is essentially a test of 1. the use of such as versus like 2. the parallelism of the coordinate conjunction either--- or and 3 the parallelism of a participle or gerund and noun
A like malaria and dengue have focused either on the vaccination of humans or on exterminating--- like can not be used to mark examples
B like malaria and dengue have focused either on vaccinating of humans or on the extermination of---- use of like is wrong
C. as malaria and dengue have focused on either vaccinating humans or on exterminating--- either vaccinating humans or on exterminating---wrong parallelism of either ---or coordinate conjunction; on the right hand side of both either and or, similar structure should be used

D as malaria and dengue have focused on either vaccinating of humans or on extermination of----- either vaccinating of humans or on extermination of --- bad co-ordinate conjunction parallelism.
E as malaria and dengue have focused on either vaccinating humans or exterminating -- - proper uaw of either or parallelism. Correct choice .
Now let us take choice B. We rejected it primarily because of the uses of like. However, how about either or parallelism? It is perfectly parallel because of the use of the pronoun on the right hand side of both either and or.
What about vaccinating of and extermination of?this is also perfectly parallel because vaccinating of is a gerund and is as good as extermination of in structure.

answered Jun 5 by Beginner (21 points)
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